You can post any kind of photos that are related to Tamilnadu. Make sure that you follow the proper guideline for posting photos. It is necessary that you should give a good description of about 20 words at least. To know about the guidelines for posting photos please follow the link below.
And another important thing is that there should not be any watermarks in the photo. If there are any water marks then it means that the photo is copy right protected. You can follow the link below to know how to find whether a photo is copy right protected or not.